Which Benefit Does Enabling External Spam Quarantine on Cisco SMA

Which benefit does enabling external spam quarantine on Cisco SMA provide?

A) ability to back up spam quarantine from multiple Cisco ESAs to one central console
B) access to the spam quarantine interface on which a user can release, duplicate, or delete
C) ability to scan messages by using two engines to increase a catch rate
D) ability to consolidate spam quarantine data from multiple Cisco ESA to one central console